I agree with you, to an extent. I think if they can dump Bolland's salary for prospets/picks, they have flexibility if someone over pays for Bickell.
If that happens, they have some space to maneuver, like Leddy, Kruger and a 1-2 year rental like VL, who is still good, was just given $32 million in the buyout and might want to take a million less to play for a champion team.
I'm not saying thats going to happen, but they can acquire/develop prospets AND lure in a solid free agent. Detroit has been very successful at managing the cap to have the option of both.